PROBLEM TO BE SOLVED: To provide a method for heat-volume reduction treatment of polyester waste plastic, which is suitable for reducing the volume of waste generated at home by simple heat consolidation and storing it cleanly. SOLUTION: An object to be treated of waste plastic waste such as polyester is treated or cumulatively charged into a container every time it is charged, and the contact surface between the waste plastic waste and the heating surfaces 4 and 7 is fused temperature or fusion temperature. The controlled heating device held below is a device that holds the object to be processed above the deformation temperature and has a substantial hot gas confinement mechanism, and is heated by the heating device by raising the airbag 8 that is movable by the bottom air pump 9. A waste plastic treatment method in which a compressive force is applied for a required time or longer, or the object to be treated is softened and then compressed to be compacted or reduced in concentration without melting or melting. [Selection diagram] Fig. 1【課題】特に家庭で発生した廃棄物を簡単な加熱圧密で減容し、清潔に保存するに適したポリエステル廃プラスチックの加熱減容処理方法の提供。【解決手段】ポリエステル等の廃プラスチック廃棄物の被処理物を投入ごとに処理または容器内に累加投入し、廃プラスチック廃棄物と加熱面４，７との接触面を融着温度または融着温度以下に保持する制御された加熱装置を、装置被処理物を変形温度以上に保持し、実質的熱気体閉じ込め機構を有する装置で、底部エアポンプ９で可動するエアバッグ８の上昇により加熱装置で加熱しつつ圧縮力を必要時間以上加えまたは被処理物の軟化後圧縮し全面溶融または溶融させずに圧密・減溶する廃プラスチック処理法。【選択図】図１
